Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7940054 | System and method to zero-sequence verify ground return path integrity by comparing measured zero-sequence current in an autotransformer with a second zero-sequence current source | Normann Fischer | 2011-05-10 |
| 7903381 | Negative sequence differential element | Normann Fischer | 2011-03-08 |